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As Nigeria prepares to mark the fourth anniversary of the Chibok kidnapping, Unicef reported on Friday that more than 1,000 children have been abducted by jihadists since 2013.

"Since 2013, more than 1,000 children have been abducted by Boko Haram in northeastern Nigeria, including 276 girls taken from their secondary school in the town of Chibok in 2014," said the United Nations children's fund in a statement.

"These repeated attacks against children in schools are unconscionable," said Mohamed Malick Fall, a Unicef representative in Nigeria.

Boko Haram's fight to establish a hardline Islamic state in northeast Nigeria has claimed at least 20,000 lives and displaced more than two million people.

Schools, particularly those with a secular curriculum, have been targeted by Boko Haram, whose name roughly translates from Hausa - the language spoken widely across northern Nigeria - as "Western education is forbidden".

At least 2,295 teachers have been killed and more than 1,400 schools destroyed by the Islamist extremists since the conflict started in 2009, according to Unicef.

While a 2015 offensive launched by Nigerian President Muhammadu Buhari successfully reclaimed swaths of territory back from the jihadists in Nigeria, the group still stages deadly attacks on military targets and civilians.

Abubakar Shekau, the mercurial Boko Haram leader responsible for using girls as suicide bombers, has claimed in videos that the girls have converted to Islam and have been "married off".

For those following Boko Haram, the Dapchi kidnapping wasn't entirely a surprise.

Over the past year, the jihadists have ramped up attacks, killing soldiers, kidnapping government workers and terrorising the northeastern city of Maiduguri with relentless suicide bombings.

Under pressure to live up to his election promise of beating Boko Haram, this month Mr Buhari reiterated his support for the release of $1 billion in emergency funds to fight the Islamists.

Mr Buhari's government has recovered scores of the girls. But the negotiations with the jihadists - which reportedly involved ransom payments and the release of high-ranking commanders - rankled critics who questioned the wisdom of funding and rejuvenating the ranks of the extremists.